<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <!-- action:提交路径
         maxlength:最大字符长度
         value:设置默认值
         readonly只读 -->
    <form action="https://www.baidu.com">
        用户名:<input type="text" name="username" maxlength="5" value="abc" readonly>
        密码:<input type="password" name="password"></input><br>

        <!-- value是单选框必须添加的属性,否则提交on
             checked默认选中 -->
        性别:<input type="radio" name="gender" checked value="m" id="r1">
        <label for="r1">男</label>
        <input type="radio" name="gender" value="w">女
        <br>

        兴趣爱好:<input type="checkbox" name="hobby" value="cy">抽烟
        <input type="checkbox" name="hobby" checked value="hj">喝酒
        <input type="checkbox" name="hobby" value="tt">烫头<br>

        生日:<input type="date" name="birthday"><br>
        靓照:<input type="file" name="pic"><br>

        所在地:
        <select name="city">
            <option value="bj">北京</option>
            <option value="sh">上海</option>
            <option value="gz">广州</option>
            <option value="sjz" selected>石家庄</option>
        </select><br>
        <input type="submit" value="注册">
    </form>
</body>
</html>